Partial nitrification and nutrient removal in intermittently aerated sequencing batch reactors treating separated digestate liquid after anaerobic digestion of pig manure |
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Authors: | Mingchuan Zhang Peadar G Lawlor Guangxue Wu Brendan Lynch Xinmin Zhan |
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Institution: | (1) Civil Engineering, College of Engineering and Informatics, National University of Ireland, Galway, Ireland;(2) Teagasc, Pig Development Department, Animal and Grassland Research and Innovation Centre, Moorepark, Fermoy, Co. Cork, Ireland;(3) Research Center for Environmental Engineering and Management, Graduate School at Shenzhen, Tsinghua University, Shenzhen, 518055, China; |
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Abstract: | The performance of an intermittently aerated sequencing batch reactor (IASBR) technology was investigated in achieving partial
nitrification, organic matter removal and nitrogen removal from separated digestate liquid after anaerobic digestion of pig
manure. The wastewater had chemical oxygen demand (COD) concentrations of 11,540 ± 860 mg/L, 5-day biochemical oxygen demand
(BOD5) concentrations of 2,900 ± 200 mg/L and total nitrogen (TN) concentrations of 4,041 ± 59 mg/L, with low COD:N ratios (2.9)
and BOD5:COD ratios (0.25). Synthetic wastewater, simulating the separated digestate liquid with similar COD and nitrogen concentrations
but BOD5 of 11,500 ± 100 mg/L, was also treated using the IASBR technology. At a mean organic loading rate of 1.15 kg COD/(m3 d) and a nitrogen loading rate of 0.38 kg N/(m3 d), the COD removal efficiency was 89.8% in the IASBR (IASBR-1) treating digestate liquid and 99% in the IASBR (IASBR-2)
treating synthetic wastewater. The IASBR-1 effluent COD was mainly due to inert organic matter and can be further reduced
to less than 40 mg/L through coagulation. The partial nitrification efficiency of 71–79% was achieved in the two IASBRs and
one cause for the stable long-term partial nitrification was the intermittent aeration strategy. Nitrogen removal efficiencies
were 76.5 and 97% in IASBR-1 and IASBR-2, respectively. The high nitrogen removal efficiencies show that the IASBR technology
is a promising technology for nitrogen removal from low COD:N ratio wastewaters. The nitrogen balance analysis shows that
59.4 and 74.3% of nitrogen removed was via heterotrophic denitrification in the non-aeration periods in IASBR-1 and IASBR-2,
respectively. |
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